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PM / OPP: fix off-by-one bug in dev_pm_opp_get_max_volt_latency loop

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Reading array at given index before checking if index is valid results in
illegal memory access.

The bug was detected using KASAN framework.

Signed-off-by: Andrzej Hajda <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Andrzej Hajda 2017-02-20 19:57:57 +01:00 • committed by Rafael J. Wysocki
commit 8cc311167c
1 changed files with 2 additions and 1 deletions
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3
drivers/base/power/opp/core.c
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@ -231,7 +231,8 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
* The caller needs to ensure that opp_table (and hence the regulator)
* isn't freed, while we are executing this routine.
*/
for (i = 0; reg = regulators[i], i < count; i++) {
for (i = 0; i < count; i++) {
reg = regulators[i];
ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
if (ret > 0)
latency_ns += ret * 1000;